In utils.py, sometimes the raw data extraction fails. The error indicates that the number of timestamps to write to disk is different from the number of samples in the channel data. Ex: For the file install_07-09-2017_0200_0400_sd09_merge.rec, the error message was `pack expected 2097334 items for packing (got 2097340)` The failed disk write happened on both the `dev` branch commit c2424a578c4dfb7f08ee17df304bf79ba7738dab and `master` branch commit 5d88362cb0595dfdc37e0c7bfadec8513d9d3e3d